Electron-ion mixed conductor electrolyte, preparation method thereof and all-solid-state battery

Abstract

The invention discloses an electron-ion mixed conductor electrolyte, a preparation method thereof and an all-solid-state battery, and relates to the field of all-solid-state batteries, transition metal sulfide, lithium-containing sulfide and sulfide solid electrolyte are compounded to construct an electron-ion mixed conductor sulfide solid electrolyte containing lithium transition metal sulfide. The electronic conductivity of the solid electrolyte is obviously improved, the solid electrolyte is mixed with an oxide positive electrode to form an ion-electron hybrid network positive electrode, the interface resistance can be reduced, and the battery performance is improved.

Description

technical field [0001] The invention relates to solid-state battery technology, in particular to an electron-ion mixed conductor electrolyte, a preparation method thereof and an all-solid-state battery. Background technique [0002] With the rapid development of fields such as electric vehicles and large-scale energy storage, higher requirements are placed on the energy density, power density, service life and safety performance of lithium-ion batteries. At present, commercialized lithium-ion batteries have serious safety problems due to their flammable organic liquid electrolytes. The batteries will overheat due to overcharging, internal short circuit and other reasons, resulting in fire or explosion accidents. At present, the safety issue of liquid electrolyte is still unresolved. In order to completely solve the safety problem of lithium-ion batteries, all-solid-state lithium-ion secondary batteries using solid-state electrolytes have received extensive attention. [00...

AI Technical Summary

Problems solved by technology

[0004] However, although the traditional sulfide solid electrolyte also has high ionic conductivity, when the oxide positive electrode is in contact with the sulfide solid electrolyte, due to the large chemical potential difference between the lithium ions, the lithium ions will Moving from the side of the sulfide solid electrolyte to the side of the oxide cathode material, the positive electrode and the electrolyte form a space charge layer at the same time, but the lower electronic conductance of the sulfide solid electrolyte layer makes the charge layer on the positive electrode side disappear, while the electrolyte side If the chemical potential of lithium ions is to be balanced, it will inevitably continue to move towards the positive electrode, and the space charge layer will continue to form, forming a very large resistance

Images